Fix missing argument

Author: DarkArc

docs/howto/patterns.rst

@@ -101,7 +101,7 @@ messages at one, an in-process queue can be leveraged::
         for message in websocket:
             await queue.put(message)
 
-    async def worker():
+    async def worker(websocket):
         while True:
             message = await queue.get()
             result = await long_running_task(message)
@@ -111,7 +111,7 @@ messages at one, an in-process queue can be leveraged::
         async with asyncio.TaskGroup() as tg:
             tg.create_task(consumer_handler(websocket))
             for _ in range(MAX_WORKERS):
-                tg.create_task(worker())
+                tg.create_task(worker(websocket))
 
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